Plaster-board.



nos. vcowlPoslTloNs,

.comms on PLASTIC. A 'l EDWAB Hopi/ps "ibs sT. LOUIS,

HARM-miie MAXWELL, F sT. LOUIS, MISSOURI.'

To all whom 'it 'may concern:

`-Be it known that I, EnwAs-D HOLMES, a citizen of the United States,residing at St. Louis, in the city of St. Louis and State of Missouri,have invented new and useful Improvements in Plaster-Boards, of whichthe following is a specification.

This invention relates to an improved plaster board designed to be us inlieu of the ordinary wall plaster in the art of finishing interior wallsurfaces.

'10 The object of the invention is to provide a plaster board which islight in Weight, inexpensive oi produc-4 ftion, durable and elllcient inuse, which possesses a .suilicient amountof resiliency to prevent itfrom break- #fing or cracking under ordinary shocks or blows, which 15may be nailed to thewall without liability of splitting Athe same or ofpreviously boring the nail holes therein, y and which may also beconveniently cut orsawed to fit -the particular part of the surface towhich it is to be ap- `plied without liability of fracture or injury tothe tools.

i V In the accompanying drawing, Figure 1 is a perspective view of aplaster board embodying my invention.

Fig. 2 is a section ofthe same.

Referring to the drawing, the nii'r'rieral 1y designates the board,which is formed of a body 2 of plastic mate 25 rial and is provided withface coverings 3 of building pa per or other suitable material.

' The' body of the board is molded from a plastic composition consistingof the following ingredients comined in the proportions set forth, towit: cement or laster of aris l part'sawdust lnpart excelsior 1 aft Ymoss' hair lugart Water, quantum su-tczt.

*he lmoss hair 1s a species of moss which grows in the swamps ofLouisiana and .`{ississippi, which after often dyed 5nd called spanishmoss.

These ingredients are thoroughly commingled and mixed with the waterasin the ordinary process of making mortar, after which a desired quantityof the mate# Specification of Letters Patent.

Application tiled J une 2,1906. Serial No. '$19,892.

being gathered is cured, picked 1 ud baled. It is quite l l rial to makea. board ofa determined thickness is placed v i l40 in a suitable moldand comprsod to form the board.

fie/60- QNITED STATES PATENT OFFICE.

MISSOURI, ASSIGNOI. OF ONE-FOURTH TO JOHN EHR E-FOURTH TO WILLIAMEHRHARDT, AND ONE-FOURTH TO STUART D.

'PLASTER-B GARD.

' Patented July 2, 1907.

After drying and before use, the layers or face coverings 3 may beapplied. These face coverings may or maynot be used, as desired.

The production of the plastic material of the aforesaid ingredients 1nthe proportions set forth results in the 45 formation of a plaster boardwhich islight in weight and may be conveniently handled, the elementsadhering tenaciously, thus giving the board increased strength.

It is found that by the use of the excelsior, which is preferably cutinto short lengths, the board is rendered less brittle and is given thequality of greater resiliency, so that comparatively hard lmocks may besustained by the board without the latter cracking or breaking. The useof the moss hair is highly desirable, inasmuch as it serves to eectuallybind the particles together in the cement, in which respect it is farsuperior to fiber and other substances commonly employed, because it islonger, lrougher and more grasping, t'. e., has a greater bindingcapacity. The excelsior is in suicient proportions to lighten the boardand coa-ct with the moss (l n hair to secure 'toughness andresiliency'.v A' plaster board embodying my invention also possesses thecharacteristics of being sufficiently tough tog enable nails to bedriven therethrough without cracking i vor fracturing the material orrendering it necessary to `previously bore holes therein for the passageof the nails to secure the board to the wall, and also of beingsufficiently soit and strong to permit it to be cut or sawcd withoutcracking or breaking the material or causing injury to the tools. 7()

,Having thus described the invention, I claim:

A molded board formed of a plastic material resulting from thecombination of a,cemen1. sawdust, gxcelsor in short lengths, moss hairand water.

In testimony whereof, I amx my signature in presence of j two witnesses.l

" "z .A EDWARD HOLMES.

Witnesses: i

JOHN Ennnannr, Jr., VSTUART D. MAXWELL.

